US7382747B2 - Selecting a subset of automatic request retransmission processes - Google Patents

Selecting a subset of automatic request retransmission processes Download PDF

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Publication number
US7382747B2
US7382747B2 US10/942,732 US94273204A US7382747B2 US 7382747 B2 US7382747 B2 US 7382747B2 US 94273204 A US94273204 A US 94273204A US 7382747 B2 US7382747 B2 US 7382747B2
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processes
subset
data packet
time slot
selecting
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US20060056343A1 (en
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Teck Hu
Yifei Yuan
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Nokia of America Corp
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Lucent Technologies Inc
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Assigned to LUCENT TECHNOLOGIES INC. reassignment LUCENT TECHNOLOGIES INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HU, TECK, YUAN, YIFEI
Priority to EP05255356A priority patent/EP1638240A1/en
Priority to KR1020050084171A priority patent/KR20060051164A/ko
Priority to CN200510104038.4A priority patent/CN1761180A/zh
Priority to JP2005267727A priority patent/JP2006094496A/ja
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1803—Stop-and-wait protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management
    • H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video

Definitions

  • This invention relates generally to telecommunication systems, and, more particularly, to wireless telecommunication systems.
  • UMTS Universal Mobile Telecommunication System
  • UE user equipment
  • DCH dedicated channel
  • Most transmissions from the mobile unit are scheduled by the base station, which may result in scheduling gain.
  • UE can autonomously transmit messages at any time without being scheduled by the base station.
  • the autonomous transmission may cause interference to other channels associated with other mobile units, thereby increasing the rise-over-thermal at the base station, as well as having other undesirable effects that may offset a portion of the scheduling gain.
  • the autonomous transmissions are typically limited to certain rates, at least in part to limit the potential interference and control the rise-over-thermal.
  • each mobile unit may transmit in autonomous mode at a minimum transmission rate of at least 8 kbps.
  • the transmission power required of the mobile units may also be limited.
  • the potential interference and rise-over-thermal may be kept with a desired range.
  • the mobile unit may also transmit autonomously at higher bit rates with correspondingly higher channel powers, if it is determined that the potential interference and/or rise-over-thermal are not above some threshold level.
  • Future generations of mobile telecommunications standards may include an “enhanced” dedicated channel (EDCH).
  • the enhanced dedicated channel may support one or more Transmission Time Intervals (TTIs), which may also be referred to as frame sizes.
  • TTIs Transmission Time Intervals
  • UMTS release 6 may support both a 10 ms TTI and a 2 ms TTI, although the 2 ms TTI is not mandatory.
  • the reduced frame sizes supported by future generations of mobile telecommunication standards may require a higher data transmission rate and, consequently, higher mobile unit transmission powers. For example, using typical assumed values for the size of a Radio Link Control (RLC) Packet Data Unit (PDU) and associated transmission overhead, the minimum data transfer rate necessary to transmit a data packet in a 2 ms TTI would be about 176 kbps. At this rate, the required channel power, or E c , may be higher than could be supported by the mobile unit without causing unacceptably high levels of interference and/or rise-over-thermal at a receiving
  • One proposal for reducing minimum data transfer rates includes restricting autonomous transmissions to a predetermined subset of TTIs. A subset of TTIs would then be assigned to each mobile unit when a communication link is established.
  • this proposal has a number of drawbacks. For one example, scheduling gain may be reduced because the mobile units are forced to transmit during the predetermined TTIs, regardless of the condition or quality of service of the uplink channel during the TTI.
  • the mobile unit may have to transmit autonomously while the uplink channel is temporarily degraded by a transient effect, such as fading, instead of rescheduling the autonomous transmission so that it is transmitted in a different TTI having a better channel condition.
  • the present invention is directed to addressing the effects of one or more of the problems set forth above.
  • a method for wireless telecommunication according to an automatic repeat request protocol supporting a plurality of processes.
  • the method includes selecting a subset of the plurality of processes based on a block size of at least one data packet, the subset comprising less than all of the plurality of processes.
  • a method for wireless telecommunication according to an Automatic Repeat Request protocol supporting a plurality of processes.
  • the method includes selecting a subset of the plurality of processes based on a block size of at least one data packet, the subset comprising less than all of the plurality of processes, associating the at least one data packet with at least one of the subset of the plurality of processes, and transmitting the at least one data packet using the at least one of the subset of the plurality of processes.
  • FIG. 1 conceptually illustrates one embodiment of a wireless telecommunication system, in accordance with the present invention
  • FIG. 2A conceptually illustrates a first embodiment of an uplink channel and a downlink channel, in accordance with the present invention
  • FIG. 2B conceptually illustrates a second embodiment of an uplink channel and a downlink channel, in accordance with the present invention.
  • FIG. 3 conceptually illustrates a method of transmitting and/or retransmitting messages based on block size according to an automatic repeat request protocol that supports a plurality of processes, in accordance with the present invention.
  • the software implemented aspects of the invention are typically encoded on some form of program storage medium or implemented over some type of transmission medium.
  • the program storage medium may be magnetic (e.g., a floppy disk or a hard drive) or optical (e.g., a compact disk read only memory, or “CD ROM”), and may be read only or random access.
  • the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art. The invention is not limited by these aspects of any given implementation.
  • FIG. 1 conceptually illustrates one embodiment of a wireless telecommunication system 100 .
  • a mobile unit 105 and a base station 110 in a cell 115 are communicatively coupled by a wireless telecommunication link 120 .
  • a wireless telecommunication link 120 Although only a single mobile unit 105 and a single base station 110 are depicted in FIG. 1 , persons, of ordinary skill in the art should appreciate that the present invention is not limited to one mobile unit 105 and one base station 110 .
  • additional mobile units 105 and/or base stations 110 may be included in the wireless telecommunication system 100 .
  • the wireless telecommunication system 100 may include a radio network controller, a mobile switching center, as well as various routers, switches, hubs, and the like.
  • the wireless telecommunication link 120 supports one or more channels that may be used to transmit messages between the mobile unit 105 and the base station 110 .
  • the channels may be defined in any desirable manner.
  • the channels may be determined according to protocols including, but not limited to, Universal Mobile Telecommunication System (UMTS), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Personal Communication System (PCS), and Global System for Mobile telecommunications (GSM).
  • UMTS Universal Mobile Telecommunication System
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • PCS Personal Communication System
  • GSM Global System for Mobile telecommunications
  • the wireless telecommunication link 120 may also support one or more packet retransmission and/or error recovery protocols.
  • the wireless telecommunication link 120 may support an Automatic Repeat Request (ARQ) protocol, a Hybrid Automatic Repeat Request (HARQ) protocol, and the like.
  • ARQ Automatic Repeat Request
  • HARQ Hybrid Automatic Repeat Request
  • FIG. 2A conceptually illustrates a first embodiment of an uplink channel 200 and a downlink channel 205 , such as may be used to transmit packets between the mobile unit 105 and the base station 110 shown in FIG. 1 .
  • the uplink channel may be an enhanced dedicated channel (E-DCH), such as defined by UMTS release 6.
  • E-DCH enhanced dedicated channel
  • the uplink and downlink channels 200 , 205 support an automatic repeat request protocol that allows a plurality of processes to operate concurrently.
  • a process is a functional unit within the mobile unit 105 and/or the base station 110 that transmits a data packet having a block size and then receives an acknowledgement (ACK or NAK) in response to the transmitted data packet. The process may then decide whether to retransmit the data packet or transmit a new data packet based on the ACK/NAK, as will be discussed in detail below.
  • Processes may be implemented in hardware, software, or any combination thereof.
  • a plurality of processes may operate concurrently.
  • the uplink and downlink channels 200 , 205 support a Hybrid Automatic Repeat Request (HARQ) protocol that allows four processes to operate concurrently.
  • HARQ Hybrid Automatic Repeat Request
  • persons of ordinary skill in the art should appreciate that the present invention is not limited to the Hybrid Automatic Repeat Request (HARQ) protocol or four concurrent processes. In alternative embodiments, any desirable repeat request protocol having any desirable number of processes may be used.
  • data packets 211 , 212 , 213 , 214 are associated with four processes, which are indicated in FIG. 2A by ID- 1 , ID- 2 , ID- 3 , and ID- 4 , respectively, and transmitted on the uplink channel 200 .
  • the data packet 211 is not received and/or decoded successfully and a negative acknowledgement (NAK) 215 associated with the first process (ID- 1 ) is provided on the downlink channel 205 .
  • NAK negative acknowledgement
  • the packet 211 is then retransmitted on the uplink 200 using the first process (ID- 1 ) in response to receiving the NAK 215 .
  • the data packet 212 is not received and/or decoded successfully and a NAK 216 associated with the second process (ID- 2 ) is provided on the downlink channel 205 .
  • the packet 212 is then retransmitted on the uplink 200 using the second process (ID- 2 ) in response to receiving the NAK 216 .
  • the data packet 213 is not received and/or decoded successfully and a NAK 217 associated with the third process (ID- 3 ) is provided on the downlink channel 205 .
  • the packet 213 is then retransmitted on the uplink 200 using the third process (ID- 3 ) in response to receiving the NAK 217 .
  • the data packet 214 is received and decoded successfully, so an acknowledgement (ACK) 218 associated with the fourth process (ID- 4 ) is provided on the downlink channel 205 .
  • ACK acknowledgement
  • a new packet 220 may now be transmitted on the uplink 200 using the fourth process (ID- 4 ) in response to receiving the ACK 218 .
  • transmissions on the wireless telecommunication link 120 are typically scheduled by the base station 110 .
  • the mobile unit 105 may also transmit messages that are not scheduled by the base station 110 .
  • Unscheduled transmissions from the mobile unit 105 will be referred to hereinafter as “autonomous” transmissions, in accordance with common usage in the art.
  • the mobile unit 105 may autonomously transmit messages (or data packets) having a block size that is approximately equal to a minimum block size for a particular Transport Format Combination (TFC), as defined by the relevant standard(s).
  • TFC Transport Format Combination
  • the messages (or data packets) sent via autonomous transmissions may contain information that is used to maintain the wireless telecommunication link 120 while the mobile unit 105 is in an idle state.
  • a subset of the automatic repeat request processes is determined based upon the block size of the message.
  • the subset includes less than all of the available processes.
  • messages having a block size about equal to a minimum transport block size may be transmitted and/or retransmitted using only the subset of the automatic repeat request processes.
  • Messages having a block size greater than the minimum transport block size may be transmitted and/or retransmitted using all of the automatic repeat request processes.
  • the mobile unit 105 may autonomously transmit and/or retransmit a message having a block size about equal to the minimum block size using two of the four available processes, whereas the mobile unit 105 may transmit and/or retransmit a message having a block size that is greater than the minimum block size using four available processes.
  • a threshold block size may be determined such that messages having a block size less than or about equal to the threshold transport block size may be transmitted and/or retransmitted using the subset of processes. Messages having a block size greater than the threshold transport block size may be transmitted and/or retransmitted using all of the available processes.
  • the subset of the processes may be determined at any desirable location.
  • the subset of the processes is determined at a central location such as a radio network controller (not shown).
  • Information indicative of the subset of the processes is then sent to the mobile unit 105 and/or the base station 110 .
  • information indicative of the subset of the processes may be sent to the base station 110 via a wired network and then the base stations may send information indicative of the subset of the processes to the mobile unit 105 via the wireless telecommunication link 120 .
  • FIG. 2B conceptually illustrates a second embodiment of an uplink channel 250 and a downlink channel 255 , such as may be used to transmit packets between the mobile unit 105 and the base station 110 shown in FIG. 1 .
  • the uplink channel 255 may be an enhanced dedicated channel (E-DCH), such as defined by UMTS release 6.
  • E-DCH enhanced dedicated channel
  • the uplink and downlink channels 250 , 255 support an automatic repeat request protocol that allows a plurality of processes to operate concurrently.
  • the uplink and downlink channels 250 , 255 support a Hybrid Automatic Repeat Request (HARQ) protocol that allows four processes to operate concurrently.
  • HARQ Hybrid Automatic Repeat Request
  • persons of ordinary skill in the art should appreciate that the present invention is not limited to the Hybrid Automatic Repeat Request (HARQ) protocol or four concurrent processes. In alternative embodiments, any desirable repeat request protocol supporting operation of any desirable number of processes may be used.
  • a subset of the four processes includes two processes, which are indicated in FIG. 2B by ID- 1 and ID- 2 .
  • Two data packets 261 , 262 are associated with the processes ID- 1 and ID- 2 , respectively.
  • the present invention is not limited to a subset of two processes selected from a set of four processes.
  • the subset may include any desirable number of processes selected from a set of any desirable plurality of processes.
  • the two data packets 261 , 262 may then be transmitted in any of the time slots 265 ( 1 - 4 ) that are associated with the four processes.
  • the two data packets 261 , 262 may be transmitted in the time slots 265 ( 1 ) and 265 ( 3 ), respectively.
  • the time slots 265 ( 1 ) and 265 ( 2 ) may be selected for transmitting the data packets 261 , 262 based on a channel condition, a quality of service, a priority, or any other desirable criteria.
  • the data packet 261 is not successfully received and decoded, and so a NAK 270 associated with the first process (ID- 1 ) is transmitted on the downlink 255 .
  • the data packet 261 is retransmitted in response to receiving the NAK 270 .
  • the data packet 262 is successfully received and decoded, and so an ACK 273 associated with the second process (ID- 2 ) is transmitted on the downlink 255 .
  • a new data packet 277 is transmitted in response to receiving the ACK 275 .
  • the data packet 261 is retransmitted in the time slot 275 ( 1 ) and the new data packet 277 is transmitted in the time slot 275 ( 4 ).
  • the data packets 261 , 277 may be transmitted and/or retransmitted in any of the time slots 275 ( 1 - 4 ).
  • any two of the time slots 275 ( 14 ) may be selected for transmitting the data packets 261 , 277 .
  • the two time slots 275 ( 1 - 4 ) may be selected based on a channel condition, a quality of service, or any other desirable criteria.
  • data packets 261 , 277 associated with the processes may be transmitted in any desirable order.
  • the data packet 277 may be transmitted before the data packet 261 .
  • FIG. 3 conceptually illustrates a method 300 of transmitting and/or retransmitting messages based on block size according to an automatic repeat request protocol that supports a plurality of processes.
  • a subset of the processes is determined (at 310 ) based on a block size of a message, as discussed in detail above.
  • each selected process in the subset carries out the steps 320 , 330 , 340 , 350 , 360 , 370 , concurrently, as indicated by the overlapping dashed boxes 315 .
  • a data packet is transmitted (at 320 ) in a selected time slots by each of the selected processes in the subset.
  • Each process 315 then receives an ACK or a NAK in response to transmitting (at 320 ) the data packet. If an ACK is received, indicating that the data packet was received and decoded, the process 315 determines (at 330 ) whether there are more data packets to transmit. If so, a new packet is transmitted (at 320 ). If not, the process 315 ends (at 350 ).
  • the process 315 determines (at 360 ) whether the data packet may be transmitted. In one embodiment, the number of retransmissions (N ret ) may be limited and the process 315 may determine (at 360 ) whether the number of previous retransmissions in greater than the allowed number of retransmissions (N ret ). If so, the process 315 ends (at 350 ). If not, the data packet may be retransmitted (at 370 ).
  • the embodiments of the present invention described above may have a number of advantages over conventional practice, as well as proposed modifications to the wireless telecommunications standards. For example, by restricting the number of processes available to send data packets to a smaller subset of the total number of available automatic repeat request processes, the effective minimum rate may be reduced accordingly because the mobile unit is not allowed to send a minimum Transport Format Combination (TFC) at every TTI. Accordingly, interference, rise-over-thermal, and other undesirable effects may be reduced.
  • TFC Transport Format Combination
  • Restricting the number of processes available to send data packets to a subset of processes may also provide the mobile unit with flexibility to choose the TTI in which the data could be sent, e.g. any 2 processes out of 6 total processes.
  • restricting autonomous transmissions to a predetermined subset of TTIs reduces the system flexibility.
  • a mobile unit may autonomously transmit minimum TFC(s) only when higher data rates have not been scheduled by a base station for the specific TTI.
  • the mobile unit is either sending a rate scheduled by the base station (e.g., a Node-B controlled TFC subset) or a rate in the minimum TFC(s) set, so the subset of allowed TTIs may not coincide with the TTI that is available when the autonomous transmission needs to be used by the mobile unit.
  • a rate scheduled by the base station e.g., a Node-B controlled TFC subset
  • a rate in the minimum TFC(s) set so the subset of allowed TTIs may not coincide with the TTI that is available when the autonomous transmission needs to be used by the mobile unit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)
US10/942,732 2004-09-16 2004-09-16 Selecting a subset of automatic request retransmission processes Active 2026-01-15 US7382747B2 (en)

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Application Number Priority Date Filing Date Title
US10/942,732 US7382747B2 (en) 2004-09-16 2004-09-16 Selecting a subset of automatic request retransmission processes
EP05255356A EP1638240A1 (en) 2004-09-16 2005-09-01 Selecting a subset of automatic request retransmission processes
KR1020050084171A KR20060051164A (ko) 2004-09-16 2005-09-09 자동 요청 재전송 프로세스들의 부분집합 선택
JP2005267727A JP2006094496A (ja) 2004-09-16 2005-09-15 自動再送要求プロセスのサブセットの選択
CN200510104038.4A CN1761180A (zh) 2004-09-16 2005-09-15 选择自动请求重传过程的子集

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CN1761180A (zh) 2006-04-19

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